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SQL Window hangs after DB Connection and SQL Developer freezes

BadlandsMar 12 2018 — edited Mar 12 2018

Windows 7 Enterprise Service Pack 1

SQL Developer 17.4.1.054.0712-x64

Oracle 12c

My SQL Developer database connections suddenly stopped working.  I checked with Amazon RDS support and everything appears to be working correctly from their perspective.  I right click on the  DB connection an choose Properties, then click on the Test button and it displays Success.  But if I then click on the Connect button a progress window pops up for a few seconds and the entire SQL Developer window freezes. 

I was experiencing this behavior on SQL Developer version 4.2, so I installed version 17.1.  The very first DB connection worked, but then I began experiencing the same thing on all subsequent DB connection attempts.  Any help would be greatly appreciated.

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Locked on Apr 9 2018
Added on Mar 12 2018
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